Hyundai Tucson Quiz
Heating, Ventilation and Air Conditioning

Heating, Ventilation and Air Conditioning Control Unit (DATC)

In this manual: Heating, Ventilation and Air Conditioning
General Information — 17Engine Mechanical System — 51Engine Electrical System — 26Emission Control System — 23Engine/Fuel Control System — 44Clutch System — 12MANUAL TRANSMISSION SYSTEM — 12AUTOMATIC TRANSMISSION SYSTEM — 42Four-Wheel Drive (4WD) System — 14Drive Shaft and Axle — 22Suspension System — 30Steering System — 16Restraint — 21Braking System — 47Body Work (Interior and Exterior) — 145Body Electrical System — 162Heating, Ventilation and Air Conditioning — 39
10steps
~60min
3/5difficulty
Done 0 of 10

Components and Component Location

COMPONENTS

CONNECTOR [A]
PIN Function PIN Function
1 Battery (+) 21 ALL1
2 ECL+ (Rear) 22 SS ISG
3 ALL2 23 Rear Window Defogger Switch (Bottom)
4 Mode Control Actuator (Event) 24 HTD (Rear Window Defogger Indicator)
5 Mode Control Actuator (Def) 25 Photo Sensor (-)_G
6 Temperature Control Actuator (Cooling) 26 Photo Sensor (-)_D
7 Driver Temperature Control Actuator (Hot) 27 IN-CAR SENSOR
8 Intake Actuator (Fresh Air) 28 EVAP Sensor
9 Intake Actuator (Recirculation) 29 AMB Sensor
10 (Feedback) Mode Control Actuator 30 Ionizer Diagnosis
11 Driver Temperature Control Actuator (Return) 31 CLEAN SIGNAL
12 Intake Actuator (Feedback) 32 -
13 Trigger Signal 33 Positive (Low) Temperature Index Enable Signal
14 C_CAN - HIGH 34 PTC Relay 2
15 C_CAN - LOW 35 PTC Relay 3
16 Fan Motor (+) 36 -
17 Field Effect Transistor Drain (Return) 37 ECV (-) (Ground)
18 FET (Gate) 38 ECV+
19 - 39 -
20 ECL-(REO) 40 Ground

Connector "B"
PIN Function PIN Function
1 Setting Sensor (+5V) 17 Passenger Seat Heater Switch
2 Passenger Temperature Control Actuator (Return) 18 Passenger Seat Heater Indicator (Top)
3 Passenger Temperature Control Actuator (Cold) 19 Passenger Seat Heater Indicator (Middle)
4 Passenger Temperature Control Actuator (Hot) 20 Passenger Seat Heater Indicator (Bottom)
5 Driver Seat Heater Switch 21 Defog Activator (Feedback)
6 Driver Seat Heater Indicator (Top) 22 Defog Activator (On)
7 Driver Seat Heater Indicator (Middle) 23 Defog Activator (Off)
8 Driver Seat Heater Indicator (Low) 24 Automatic Defog Prevention Temperature
9 Driver Seat Cooling Switch 25 Automatic Defog Removal SCK
10 Driver Seat Cooling Indicator (Top) 26 Automatic Defog Prevention Data
11 Driver Seat Cooling Indicator (Middle) 27 Steering Wheel Heater Switch
12 Driver Seat Cooling Indicator (Bottom) 28 Steering Wheel Heater Indicator
13 Passenger Seat Cooling Switch 29 -
14 Passenger Seat Cooling Indicator (Top) 30 -
15 Passenger Seat Cooling Indicator (Middle) 31 Mass Air Flow Sensor
16 Passenger Seat Cooling Indicator (Bottom) 32 Ground

Repair Procedures

Self-Diagnosis

  1. Self-Diagnosis Procedure.
  2. DTC DISPLAY
    1. Continuous operation: DTC.
    2. Continuous operation: DTC.
    3. Step-by-step operation. A. Malfunction code one or normal operation continues. B. Malfunction code.
  3. If diagnostic trouble codes appear during inspection, check the causes related to these codes.
    Display Description of Malfunction
    0 Normal
    11 IN-CAR SENSOR OPEN
    12 IN-CAR SENSOR SHORT
    13 Ambient Sensor Open
    14 Ambient Temperature Sensor Shorted
    17 Evaporator Sensor Open
    18 EVAPORATOR SENSOR SHORT
    19 OPEN or SHORT in Temperature Door Potentiometer. Driver
    20 Temporary Door Potentiometer Error Driver
    21 OPEN or SHORT in Door Potentiometer Mode
    22 Door Potentiometer Error Mode
    25 OPEN or SHORT in Intake Door Potentiometer
    26 Intake Door Potentiometer Error
    31 Auto Defog Sensor (Open)
    Automatic Defog Prevention Sensor (SHORT)
    32 OPEN or SHORT in Temperature Door Potentiometer. Passenger
    40 OPEN or SHORT in Automatic Heater Actuator
    41 Defog Door Potentiometer Malfunction
    44 Instrument Cluster Anion Generator Error
    45 APT CAN signal error
    47 CAN Engine Speed Signal Error
    48 CAN Vehicle Speed Signal Error
    49 CAN Engine Coolant Temperature Signal Error
    71 ECV Malfunction
  4. Fail-safe
    NO Item Abnormality Fail-safe
    1 IN-CAR SENSOR Open Circuit or Short Circuit Check with value at 25 °C
    2 Ambient Sensor Open Circuit or Short Circuit Check with value at 20 °C
    3 WITH EVAPORATOR SENSOR Open Circuit or Short Circuit Check with value at -2°C (28.4°F)
    4 Door Mode Potentiometer Open Circuit or Short Circuit Adjust the vent position when the vent mode is selected.
    Set the defrost position when any mode except vent is fully selected.
    Fix the vent position by selecting ALL ON → OFF.
    Set the defrost position by selecting purge. Floor.
    5 Temperature Door Potentiometer (MTC) Open Circuit or Short Circuit If the temperature setting is at 1 ~ 7, fix the door at the maximum cooling position.
    If the temperature setting is 8 ~ 15, fix the door at the maximum heating position.
    6 Temperature Door Potentiometer (DATC) Open Circuit or Short Circuit When the temperature is set to 17 °C ~ 24 °C, fix the door at the maximum cooling position.
    When the temperature is set to 25 °C ~ 32 °C, set the door to the maximum heating position.
    7 Intake Door Potentiometer Open Circuit or Short Circuit Adjust the vent position when the vent mode is selected.
    Set the defrost position when any mode except vent is fully selected.

REPLACEMENT

  1. Disconnect the negative (-) battery terminal.
  2. Using a screwdriver or removal tool, remove the center console panel switch (A).
  3. Disconnect the hazard warning switch connector (A) and the hose (B).
  4. Loosen the mounting screws, then remove the heater and A/C control unit (A).
  5. Disconnect the air conditioner controller connector and heater connector (A).
  6. To install, perform the removal procedure in reverse order.

Test yourself

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